Filter unit for air purification device
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Solution Overview
Problem
Existing air cleaning devices face inefficiencies in particle separation due to homogeneous electrical fields, requiring high ionization currents or insufficient separation, especially under non-homogeneous flow conditions.
Innovation Solution
The filter unit adapts the geometry of the ionization unit to match flow conditions by non-equidistantly distributing ionization components, creating regions with higher electric field strength for efficient charging and separation, reducing the need for high ionization currents and minimizing ozone formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a homogeneous electric field is generated using conventional electrostatic separation devices, then the device structure is simple, but particle separation efficiency is insufficient unless high ionization current is applied
Solution Approach 1:
The patent applies local quality by creating non-uniform spacing between ionization components and grounded electrodes, resulting in a non-homogeneous electric field with varying field strength in different regions. This allows the electric field to be adapted to local flow conditions, achieving efficient particle charging and separation without requiring uniformly high ionization current throughout the entire device
Solution Approach 2:
The patent changes the geometric parameters of the electric field configuration by arranging ionization components at non-equidistant positions. This parameter change transforms the homogeneous electric field into a non-homogeneous one, enabling the field strength to vary spatially and match the non-uniform flow conditions, thereby improving separation efficiency while reducing overall energy consumption
2Reliability
If high ionization current is applied to ensure sufficient particle separation in homogeneous electric field, then particle separation is improved, but ozone formation increases and energy consumption rises
Solution Approach 1:
By creating regions of different electric field strength through non-equidistant component arrangement, the patent concentrates ionization activity only where needed to match local flow conditions. This prevents excessive ionization in low-flow regions, thereby reducing unnecessary ozone generation while maintaining adequate particle separation efficiency
Solution Approach 2:
The patent converts the potentially harmful effect of homogeneous high-intensity ionization (which causes excessive ozone) into a beneficial non-uniform field distribution. The electric field strength is optimized locally, achieving effective particle charging only where flow conditions require it, thus transforming a harmful side effect into a controlled and beneficial process
3Adaptability or versatility
If ionization components are arranged equidistantly, then device design is simple, but flow conditions cannot be adequately addressed
Solution Approach 1:
The patent implements local quality by arranging ionization components with non-equidistant spacing to create electric field regions that adapt to varying flow conditions. Different regions of the device have optimized field strengths matching local airflow characteristics, improving adaptability while maintaining a relatively straightforward device structure
Solution Approach 2:
The patent applies asymmetry by deliberately using non-uniform spacing between ionization components and grounded electrodes. This asymmetric arrangement breaks the symmetry of conventional equidistant designs, enabling the electric field to adapt to the asymmetric nature of real-world flow conditions while adding minimal complexity to the overall device
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures efficient charging and reliable separation of particles, even under non-homogeneous flow conditions, with reduced ionization current and ozone formation.
Implementation Method 1
This type of separation device utilizes a corona discharge at the wire-shaped ionization electrode (spray wire). The corona forms between the spray wire and the grounded, plate-shaped electrodes.
Implementation Method 2
The contaminants present in the airflow, also known as particles, are charged as they pass through the volume located between the grounded electrodes, in which the ionization electrode is positioned
Implementation Method 3
The contaminants present in the airflow, also known as particles, are charged as they pass through the volume located between the grounded electrodes, in which the ionization electrode is positioned, and are subsequently deposited in the separation unit of the electrostatic precipitator.
Data Source
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AI summary
The invention relates to a filter unit for an air purification device (1), comprising an ionization unit (22) and a separation unit (21) which is connected downstream of the ionization unit (22) in the direction of flow, wherein the ionization unit (22) has an air inlet opening (200) and at least two ionization components (220, 221, 222), of which at least one is an elongated ionization element (220) and at least one is a grounded electrode (221, 222). The filter unit (2) is characterized in that the ionization components (220, 221, 222) are arranged non-equidistantly in a plane direction (x, z) of the air inlet opening (200). Furthermore, an air purification device (1) with such a filter unit (2) is described.